Improvement in screw-cutting dies



G, B. STET'SDN.

Screw-Cutting Die.

Patented Aug. 24,1875.

mmm

- ATTORNEYS.

N. PETERS. know-Emmi":

UNITED STATES PATENT QFFIGE.

GEORGE E. STETSON, OF NEW BEDFORD, MASSACHUSETTS.

IMPROVEMENT IN SCREW-CUTTING DIES.

Specification forming part of Letters Patent No. 167,035, dated August24, 1875 application filed August 6, 1875.

To all whom it may concern Be it known that I, GEORGE R. STETsoN, of NewBedford, in the county of Bristol and State of Massachusetts, haveinvented a new and Improved Screw-Cutting Die, of which the following isa specification:

In this improvement the chasersare fitted in sockets of a solid die,tapered so that the chasers are held by a binding-screw at one side ofeach, and two of the chasers are provided with an adjusting-screw to setthem up toward the others as the chasers wear away. The arrangementatfords a simple means of holding, and detaching and attaching chasersfor changing from one. size of thread to another, and of setting them upas they wear.

Figure 1 is a plan view of my improved die, with a part in horizontalsection, and Fig. 2 is a transverse section of Fig. 1 on line a; :0.

Similar letters of reference indicate corresponding parts.

A is the solid die-stock, in which thechasers B are fitted in slotstapered in the transverse direction of the chasers, as shown in Fig. 2,so that they are held in place by a screw, 0, screwing down against thewide side, being a simple arrangement, very cheap to construct and easyto change. Two of the chasers have an adjusting-screw, E, for settingthem up to compensate for wear.

Having thus described my invention, I claim as new and desire to secureby Letters Patent 1. The chasers B fitted in tapered slots in the soliddie-stock A, and secured by a binding-screw, O, in the manner described.

2. The combination, with the chaser B fitted in a tapered slot andsecured by a binding-screw, G, of an adjusting-screw, E, substantiallyas specified.

GEORGE R. STETSON. Witnesses:

FRANCIS B. GREENE, ALBERT B. COLLINS.

